WO2008012911A1

WO2008012911A1 - Electrode needle device with temperature sensor

Info

Publication number: WO2008012911A1
Application number: PCT/JP2006/314960
Authority: WO
Inventors: Susumu Kobayashi
Original assignee: Kabushiki Kaisha Top
Priority date: 2006-07-28
Filing date: 2006-07-28
Publication date: 2008-01-31
Also published as: EP2047817B1; US8187264B2; EP2047817A4; EP2047817A1; CA2655221A1; US20090228004A1

Abstract

An electrode needle with a temperature sensor, the electrode needle having a hollow outer needle (1), an inner needle (2), and a connection tube (3) connected to a base end section of the outer needle. The outer needle (1) is capable of being inserted into a diseased part of a patient and whose outer peripheral surface excluding the forward end portion is covered with an insulative coating (11). The inner needle (2) has the temperature sensor (21) at its forward end. A high-frequency current is supplied to the outer needle via the inner needle. A base end section (22) of the inner needle is inserted in the connection tube so as to be axially positionally adjustable by simple operation. In the connection tube (3)is provided a spring member (32) having a wound section (32a) wound around the outer periphery of the base end section (22) of the inner needle (2) and also having a fixation section (32b) fixed to the connection tube (3). When the base end section (22) of the inner needle (2) is rotated in the direction opposite the winding direction of the wound section (32a), the base end section (22) of the inner needle (2) axially moves.

Description

Specification

Electrode needle device with temperature sensor

Technical field

TECHNICAL FIELD [0001] The present invention relates to an electrode needle device with a medical temperature sensor that is used to perform high-frequency thermal coagulation, cauterization, or the like of a diseased part by applying a high-frequency current to the diseased part.

Background art

[0002] Conventionally, as an electrode needle device for medical use, it comprises a hollow outer needle that can puncture an affected area, and has an outer peripheral surface excluding a distal end portion, and an inner needle that is inserted through the outer needle. It is known that a high-frequency current is supplied to the outer needle through the inner needle so that a high-frequency current flows through the affected part of the tip of the outer needle that is not coated with an insulating coating. In this case, a temperature sensor is attached to the distal end portion of the inner needle, and the temperature of the affected area can be grasped by this temperature sensor (see, for example, US Pat. No. 4,411,266).

[0003] By the way, the length of the outer part varies depending on the manufacturer, and even for the same manufacturer, there is a slight difference between products. Therefore, in order to accurately grasp the temperature of the affected area, the position of the temperature sensor must be It is necessary to adjust the length according to the length of the outer needle, that is, to adjust the position of the inner needle having the temperature sensor at the tip portion in the axial direction with respect to the outer needle. In view of this, a connecting cylinder connected to the proximal end of the outer needle is conventionally provided, and the proximal end of the inner needle is inserted into the connecting cylinder so as to be adjustable in the axial direction.

[0004] In this structure, a radial screw hole is formed in the peripheral wall portion of the connecting cylinder, and a set screw screwed into the screw hole is pressed against the outer peripheral surface of the proximal end portion of the inner needle, thereby The part can be fixed. However, in this case, when adjusting the position of the inner needle, it is necessary to loosen or tighten the set screw one by one, which is a troublesome operation.

Disclosure of the invention

[0005] In view of the above points, the object of the present invention is to provide an electrode needle device with a temperature sensor that is excellent in operability so that the position adjustment of the inner needle can be performed with a simple operation. .

[0006] In order to achieve this object, the present invention is capable of puncturing the affected area and excluding the tip. A hollow outer needle with an insulating coating on the outer peripheral surface, and an inner needle with a temperature sensor at the tip that is inserted through the outer needle, and a high-frequency current is supplied to the outer needle through the inner needle. An electrode needle device with a temperature sensor that includes a connecting cylinder connected to the proximal end of the outer needle, and in which the proximal end of the inner needle is inserted into the connecting cylinder so as to be adjustable in the axial direction. A spring member having a winding portion wound around the outer periphery of the proximal end portion of the inner needle and a fixing portion fixed to the coupling tube is provided in the connecting tube, and the proximal end portion of the inner needle is connected to the winding portion of the winding portion. By rotating in the direction opposite to the turning direction, the proximal end of the inner needle can move in the axial direction.

[0007] According to the present invention, the proximal end portion of the inner needle does not move relative to the connecting cylinder due to the frictional force acting between the wound portion of the spring member and the outer peripheral surface of the proximal end portion of the inner needle. When the base end portion of the inner needle is rotated in the direction opposite to the winding direction of the winding portion, a force that unwinds this acts on the winding portion and acts between the winding portion and the outer peripheral surface of the base end portion of the inner needle. The frictional force is reduced. Therefore, the proximal end portion of the inner needle is moved in the axial direction with respect to the connecting cylinder, and the position of the inner needle, that is, the temperature sensor at the distal end portion thereof can be adjusted in the axial direction with respect to the outer needle. And, when adjusting the position of the inner needle, the operation that does not require loosening or tightening the set screw as in the prior art is simplified.

[0008] Further, simply pushing and pulling the proximal end portion of the inner needle in the axial direction makes it difficult to perform fine position adjustment due to excessive force applied. It is common to perform a combined operation of pushing and pulling while rotating the proximal end of the needle. In the present invention, since the winding part can be unwound using the rotation of this combined operation, the position of the inner needle can be adjusted by a very rational operation, and the operability is excellent.

[0009] As the spring member, a coil spring or a spring can be used. When the spring member is constituted by a coil spring, the coil spring is formed to have a reduced diameter portion and an enlarged diameter portion, and the reduced diameter portion is used as a winding portion around the proximal end portion of the inner needle. What is necessary is just to make an enlarged diameter part the fixed part with respect to a connection pipe | tube. When the spring member is constituted by the spring, the radially inner part of the spring is used as a wrapping part for the proximal end of the inner needle, and the radially outer part of the spring is used as a fixing part for the connecting cylinder. I should do it.

[0010] By the way, since a high frequency current flows through the inner needle, if the temperature sensor is in contact with the inner needle,

The high frequency noise is mixed in the output signal of the temperature sensor, and the temperature measurement accuracy is deteriorated. this If the inner needle is hollow and a cap is attached to the tip, and the temperature sensor is attached to the inner surface of the cap while being electrically insulated from the inner needle, high-frequency noise will be mixed in the output signal of the temperature sensor. Without this, accurate temperature measurement becomes possible.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a first embodiment of the electrode needle device of the present invention, FIG. 2 is a transverse sectional view taken along line II-II in FIG. 1, and FIG. 3 is a second embodiment of the electrode needle device of the present invention. Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 3.

Referring to FIG. 1, an electrode needle device according to a first embodiment of the present invention includes a metal hollow outer needle 1, a metal inner needle 2 inserted through the outer needle 1, and an outer needle. 1 is provided with a connecting tube 3 made of resin and connected to the base end of 1. The tip of the outer needle 1 is sharply formed so that the affected part can be punctured. Further, the outer needle 1 is provided with an insulating coating 11 on the outer peripheral surface excluding the tip. The outer needle 1 is detachably connected to the luer taper portion 31 at the distal end of the connecting tube 3 with the hub 12 at the proximal end.

[0013] The inner needle 2 is formed hollow. Further, a temperature sensor 21 having a thermocouple force is attached to the inner surface of the cap 2 a attached to the tip of the inner needle 2 in a state of being electrically insulated from the inner needle 2 by the adhesive 22. Then, two wires 21 a connected to the temperature sensor 21 are passed through the inner needle 2, and the temperature indicator 4 is connected to the wires 21 a. In addition, the temperature detected by the temperature sensor 21 can be displayed on the temperature indicator 4. The inner needle 2 is filled with an insulating material such as magnesium oxide. A high frequency power source 5 is connected to the inner needle 2. The inner needle 2 is brought into contact with at least a part of the inner peripheral surface of the outer needle 1 so that a high-frequency current is supplied to the outer needle 1 through the inner needle 2. The insulation part 11 is applied to the affected area where the outer needle 1 has been punctured, and a high-frequency current flows from the distal end of the outer needle 1, and treatment such as high-frequency thermal coagulation and cauterization is performed on the affected area.

[0014] Even if a high-frequency current is passed through the inner needle 2, the temperature sensor 21 is mounted in an electrically insulated state with respect to the inner needle 2 as described above. Noise is not mixed and the temperature can be measured accurately.

[0015] The proximal end portion of the inner needle 2 is a sleeve 23 that is inserted into the connecting cylinder 3 and is externally fixed to the inner needle body. It is composed. A large-diameter knob portion 23 a is formed at the proximal end of the sleeve 23 exposed at the tail of the connecting cylinder 3. In addition, a spring member 32 having a winding part 32 a wound around the outer periphery of the sleeve 23 and a fixing part 32 b fixed to the connection cylinder 3 is provided in the connection cylinder 3. In the present embodiment, the spring member 32 is a coil spring 6 having a reduced diameter portion whose coil inner diameter is substantially equal to the outer diameter of the sleeve 23 and an enlarged diameter portion whose coil outer diameter is substantially equal to the inner diameter of the connecting cylinder 3. The reduced diameter portion is a winding portion 32a around the sleeve 23. Further, the enlarged diameter portion 6b is fixed to the inner peripheral surface of the connecting cylinder 3 by high frequency induction heating or the like, thereby forming a fixing portion 32b for the connecting cylinder 3. The coil spring 6 is formed so that there is no gap in the axial direction.

[0016] Here, the winding direction of the winding portion 32a is the counterclockwise direction when viewed from the axial direction tail as shown in FIG. Normally, the sleeve 23 does not move relative to the connecting cylinder 3 due to a frictional force acting between the winding portion 32a and the outer peripheral surface of the sleeve 23. On the other hand, when the knob portion 23a is picked and the sleeve 23 is rotated clockwise in FIG. 2, a force for unwinding the winding portion 32a is applied between the winding portion 32a and the outer peripheral surface of the sleeve 23. The acting friction force is reduced. Therefore, it is possible to adjust the position of the inner needle 2, that is, the temperature sensor 21 at the tip end thereof in the axial direction with respect to the outer needle 1 by moving the sleeve 23 in the axial direction with respect to the connecting cylinder 3. As a result, even if the length of the outer needle 1 changes slightly, the temperature sensor 21 can be placed at the optimum position on the needle tip side of the outer needle 1 to accurately grasp the temperature of the affected area.

[0017] By the way, simply pushing and pulling the sleeve 23 in the axial direction makes it difficult to perform fine position adjustment by excessively applying force. Therefore, when performing fine position adjustment, it is common to perform a combined operation of pushing and pulling while rotating the sleeve 23. In this embodiment, the position of the inner needle 2 (temperature sensor 21) is adjusted by a very rational combined operation in which the sleeve 23 is rotated in the clockwise direction and pushed and pulled in the axial direction. Excellent operability.

Next, an electrode needle device according to a second embodiment of the present invention will be described with reference to FIGS. 3 and 4. The same members as those in the first embodiment in the second embodiment are denoted by the same reference numerals as above. The difference from the first embodiment is that the spring 7 is used as the spring member 32. Here, the radially inner part of the spring 7 is wound around the sleeve 23. It is a part 32a. Further, a claw portion that engages with an engagement hole 33 formed in the peripheral wall portion of the connecting cylinder 3 is formed in the radially outer portion of the mainspring spring 7, and this claw section serves as a fixing portion 32 b for the connecting cylinder 3. In addition, the radially outer portion of the mainspring spring 7 may be fixed to the connecting cylinder 3 by high frequency induction heating or the like, and this portion may be used as a fixing portion 32b for the connecting cylinder 3.

[0019] The winding direction of the winding portion 32a is counterclockwise when viewed from the axial direction as shown in FIG. Therefore, when the sleeve 23 is rotated in the clockwise direction in FIG. 4, a force for unwinding this acts on the winding portion 32a. As in the first embodiment, the sleeve 23 is moved in the axial direction with respect to the connecting cylinder 3, and the position of the inner needle 2 (temperature sensor 21) in the axial direction with respect to the outer needle 1 can be adjusted. It becomes possible.

[0020] The force described above with reference to the drawings for the embodiments of the present invention is not limited to this. For example, in the above embodiment, the outer peripheral surface of the sleeve 23 is formed as a cylindrical surface, but a ridge extending in the generatrix direction may be formed on the outer peripheral surface of the sleeve 23. According to this, when the sleeve 23 is rotated in the direction opposite to the winding direction of the winding portion 32a, the protrusion engages with the edge of the winding portion 32a, and the force to unwind the winding portion 32a is effective. It will be transmitted efficiently. In the above embodiment, a thermocouple is used as the temperature sensor 21, but a temperature sensor other than a thermocouple such as a thermistor can also be used.

FIG. 1 is a longitudinal sectional view showing a first embodiment of the device of the present invention.

FIG. 2 is a cross-sectional view taken along line II-II in FIG.

FIG. 3 is a longitudinal sectional view showing a second embodiment of the device of the present invention.

FIG. 4 is a cross-sectional view taken along line IV—IV in FIG.

Explanation of symbols

[0022] 1 ··· Outer needle, 11 ··· Insulation coating, 2 · · · Inner needle, 2a ··· Cap, 21 ··· Temperature sensor, 23 ··· Sleeve (base end of inner needle), 3 ... Connecting cylinder, 32 ... Spring member, 32a ... Winding part, 32b ... Fixed part, 6 ... Coil spring, 7 ... Spring spring.

Claims

The scope of the claims

[1] A hollow outer needle that can puncture the affected area and has an outer peripheral surface that is covered with an insulating coating, and an inner needle that is inserted through the outer needle and has a temperature sensor at the distal end. An electrode needle device with a temperature sensor configured to supply a high-frequency current through an inner needle, comprising a connecting cylinder connected to the proximal end of the outer needle, and the proximal end of the inner needle being connected to the connecting cylinder In what is inserted to adjust the position in the axial direction,

A spring member having a winding portion wound around the outer periphery of the proximal end portion of the inner needle and a fixing portion fixed to the connecting tube is provided in the connecting cylinder, and the proximal end portion of the inner needle is wound around the winding direction of the winding portion; An electrode needle device with a temperature sensor, characterized in that the proximal end portion of the inner needle can move in the axial direction by rotating in the reverse direction.

[2] The spring member is constituted by a coil spring having a reduced diameter portion and an enlarged diameter portion, and the reduced diameter portion of the coil spring serves as the winding portion, and the enlarged diameter portion of the coil spring serves as the fixed portion. The electrode needle device with a temperature sensor according to claim 1.

3. The spring member is constituted by a spring, and a radially inner portion of the spring is the winding portion, and a radially outer portion of the spring is the fixing portion. Electrode needle device with temperature sensor.

[4] The inner needle is hollow, a cap is attached to the tip, and the temperature sensor is attached to an inner surface of the cap in a state of being electrically insulated from the inner needle. The electrode needle device with a temperature sensor as described.